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Explain the keywords - native, transient, volatile, finally
vinaymudgil007
- Jun 2nd, 2008
Native :- Specifies that the code that should be implemented is writtern in a language other than JAVATransient :- Specifies that the associated variable should NOT be serializedVolatile :- directs th...
Siva Prasad Ashwini
- Oct 17th, 2005
native:when you want to get functionality from particular language like c/c++ native is usedTransient : it is state of which value doesnt persist volatile : is an indication to the compiler that ...
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Why multiple inheritance using classes is disadvantage in java
sampra
- Mar 13th, 2012
Java is build based on concept of no multiple inher to avoid memory usage and ambiguity too
A.Bava Bahrudeen
- Sep 17th, 2011
Multiple inheritance does not support in java. Because, ambiguity has been involved in the multiple inheritance in C++ language. That means, a class access the same properties of more than one class....
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What is the basic difference between Java and .Net
akhilmisra
- Feb 8th, 2009
JAVA is platform independent while .Net works only for the MS platforms. .Net supports an array of languages while for working with J2EE you have only one option and that is 'JAVA". .Net work...
krupananda
- Jun 17th, 2008
No thats not true. Java has a byte code editor too.. Refer : http://www.cs.ioc.ee/~ando/jbe/
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How many threads will be created for a java program, when it is compail & run? and what are they?
Plz give answer
Yasin
- Jul 24th, 2007
Only one thread(Main thread) will be created. Below are the total threads running in JVM when run a java program.1. Main Thread2. Javadb Thread3. Break Point Handler Threas4. Finalize thread5. Reference Handler6. Signal Dispatcher7. Step Handler Thread
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How and when to prevent inheritance?
vinaymudgil007
- May 29th, 2008
Two ways: -(1) mark the class as final(2) make its constructor private -- in this case we will also not be able to instantiate a class from any other classany doubts, let me knowVinny
iyck
- Jul 5th, 2006
If we make Final class we cannot extend, also if we make all the constructor private then we cannot extend that class, is this also prevents inheritence?
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1. Can You catch the Error? 2. Difference between compiletime exception and runtime exception?3. How you throw user defined exception?4. How you handle throwable while using exceptions ?5. What are the methods available in Object ?6. Is there any methods available in serialization ?7. How you seralize an Object ?8.How you get the serialized object ? 9. Any methods available in deseralization ?
rammaheswara
- Sep 29th, 2009
Yes, you can catch the Error as it is a subclass of Throwable, but you are not supposed to.For most of the errors like ( out of memry), there is no use of catching the error.MAHES
ambuj
- Jun 28th, 2007
No, because error is not related to ur progamming envirnment through which we can apply our exception handling mecanism. It?occurs only due to operating system failure, System virus affected etc.
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Compare String object with StringBuffer object.
divya_mini4u
- Sep 22nd, 2010
String objects are immutable in the sense once created cannot be changed, whereas StringBuffer object is mutable and can be changed i.e it saves memory space
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Can i expand an interface?
sriharshanamala
- Mar 1st, 2008
Yaa sure an interface can extend another interfacebut it can not implement another interface..
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Marker interface having no methods right.. then what is the use of marker interface? for what purpose we use marker interface?
Ravi.Hingarajiya
- Aug 27th, 2009
It is used to identify class. In the read project, there are so many classes. It can identify that which class belongs to which module Exmaple : Cloneable interface can be cloned. The Java compi...
amitabh26d
- Aug 26th, 2009
Marked interfaces is for compiler use and we need not have to worry about its implementation.? Yes it does not have any methods, it is because by implementing marked interfaces we are telling a compiler?that it can optimise this class as per the specification of Java for that interfaces.
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Which one is faster interms of accessing, interface or abstract class?
narendra
- Jul 28th, 2011
No, Suppose both have abstract method then ?
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How to call a static block in one class from another class?. And is it possible to call a free floating block in one class from another class?. How?
vinaymudgil007
- Jun 11th, 2008
static block gets executed whenever is class is loaded by the JVMso what you can do is.....write is class having static block in it ---> compile it --> write another class (ensure that fir...
NavaNani
- Apr 7th, 2008
Non static blocks & Static blocks are executed one by one by the order of their defintion before any constructor is being executed.Static blocks can also be invoked without creating instance ...
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What is the use of Empty Interface?
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ToString function
What is the default value for toString() in java? Explain me with an example?
sivapurammani
- Jul 10th, 2013
Default value is String representation of any Object. "java class Student { int rollNo; String name; public Student(int rollNo, String name){ this.rollNo = rollNo; this.name = n...
Nikhil
- Feb 21st, 2013
If toString() method is not overriden, it will return
public String toString() {
return getClass().getName() + "@" + Integer.toHexString(hashCode());
}
This is Object version of this method. -
What is the difference between abstraction, encapsulation and data hiding?
VishnuPrasad88
- Oct 4th, 2010
1. Encapsulation means Binding the Data with its relative functions. That means only those functions can access the data, and no other function can access that data. This can be achieved by classifyin...
lhariPrasad
- Mar 18th, 2008
Venkat,The thing which you mentioned can also be done by Inheritance, then what is the need of Abstraction over here in Java. Is it that much important ?I feel Abstraction is something where a specific template like structure is created for the implementators, aiming to provide a common interface.
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When you have an object passed to a method and when the object is reassigned to a different one, then is the original reference lost
Aqan12
- Jun 4th, 2010
Primitives are always passed by value.Objects: Passed by value of reference. i.e. a copy of reference is passed into the method. Any changes to the reference itself will not be visible outside the met...
Scorpio_
- May 7th, 2010
Mr Ashutosh Gupta,Java is pass-by-value. For primitives, you pass a copy of the actual value. For references to objects, you pass a copy of the reference. You never pass the object. All objects are stored on the heap. Always http://www.javaranch.com/campfire/StoryPassBy.jsp
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Whether a Class,Method can be garbage collected or not?How?
MMK143
- Mar 28th, 2010
Class and Method are not garbage collected because class and methods are the predefined instruction formats for developing an object oriented programming.
umesh_kilkile
- Mar 23rd, 2010
No. Class and methods aren't garbage collected.Because Class is a logical construct in that we write methods or logics.When we run Java program, class gets loaded in main memory that is RAM and method...
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Does Java have "goto"?
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Core Java Interview Questions
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